Brake mechanism



. Oct. 5, 1937.

F. MAIN ET AL BRAKE MECHANI SM Filed May 15, 1936 4 Sheets-Sheet l CHARLES AwSAWTELLE m m w m FRANK L. MAIN A TTORNEYS Get. 5, 1937. I i L. MAIN ET AL 2,

BRAKE MECHANISM F iled May 15, 1936 4 Shees-Sfieet 2 F 6.9. W INVENTORS FRANK L. MAIN CHARLES A. SAWTELLE A TTORNEYS I Oct. 5, 1937. F, L, MAW H M 2,095,034

BRAKE MECH'ANI SM Halo. 4 Fla-l2;

[N VENTORS FRANK L.MAIN CHARLES A.$AWTELLE B) ,I

:1 TTORNE Y5 Oct. 5, 1937. L M r AL 2,095,034

BRAKE MECHANISM Filed May 15, 1936 4 Sheets-Sheet 4 I \\\\\\\\m i I v .4: INVENTORS \w FRANK L. MAIN CHARLES A. SAWTELLE A TTORNE VS Patented Oct. 5,1937 2,095,034

UNITED STATES PATENT OFFICE BRAKE MECHANISM Frank L. Main, Birmingham, and Charles A.

Sawtelle, Detroit, Mich, assignors to Kelsey- Hayes Wheel Company, Detroit, Mich., a corporation of Delaware Application May 15, 1936, Serial N0. 79,992

15 Claims. (Cl. 188-79.5)

The invention relates to brake mechanisms and shown particularly in Figure 5. 'I is a suitable refers more particularly to adjustment anchor actuator between the upper ends of the shoes for devices. spreading the same apart and into frictional en- The invention has for one of its objects to progagement with the brake flange and 8 is the advide an improved adjustment anchor device justment anchor device between the lower ends 5 which provides for all movement of its parts and of the shoes. 3 are suitable coil springs between the brake friction element required during the the upper ends and the lower ends of the shoes application of the brake mechanism and which for retracting and holding the same in their noralso avoids binding of the parts and brake fricmal or inoperative positions.

tion element. The invention has for other ob- The adjustment anchor device in general com- 10 jects to so construct the adjustment anchor deprises an adjustment bracket having inner and. vice, that it serves to guide an adjustment link outer portions respectively at the inner and outer operatively connected to the brake friction elesides of the backing plate 2. The inner portion ment; that it may also serve to guide the brake is adapted to guide suitable elements about which friction element; and that it may be simplified the lower ends of the shoes fulcrum while the 15 and made to cooperate with the backing plate outer portion is adapted to carry suitable eleto eifect the guiding. The invention has for a ments for adjusting the first mentioned elements.

further object to provide a construction of ad- More in detail, the adjustment bracket comjustment anchor device the parts of which may prises the tubular member 9 at the outer side of be readily and cheaply manufactured and asthe backing plate internally threaded at ID for sembled. engagement with the screw I I having a polygonal The invention has for these and other objects outer end for engagement by a suitable tool, such the novel combinations and. arrangements of as a wrench. The tubular member has the enparts as more fully hereinafter set forth. larged portion I2 which extends through an In the drawings: I opening in the backing plate and which is pro- 25 Figure l is a side elevation, partly in section, vided with the foot flanges I3 adapted to be fixedof a brake mechanism showing an embodiment 1y secured to the outer side of the backing plate of our invention; by suitable means, such as rivets. I4 is an ad- Figures 2, 3, 4 and 5 are cross sections respecjustment plate at the inner side of the backing tively on the lines 2-2, 33, 4-4 and 5-5 of plate. This adjustment plate is preferably 30 Figure formed of sheet metal and has the back I5 which Figure 6 is a side elevation of a portion of a extends parallel to and is spaced from the adjabrake mechanism showing another embodiment cent portion of the backing plate. The adjustof our invention; ment plate also has at its sides the shouldered Figures 7 and 8 are cross sections respectively tongues I6 which extend transversely of the back 35 on the lines 'I'I and 88 of Figure 6'; and have shoulders abutting the backing plate Figure 9 is a view similar to Figure 6 showing and reduced portions extending therethrough another embodiment of our invention; and peened or riveted over against the outer side Figures 10 and 11 are cross sections respectivethereof. ly on the lines Ill-I0 and II II of Figure 9; The portion of the backing plate to which the 40 Figure 12 is a side elevation of an adjustment adjustment anchor device is secured is laterally link; 7 offset in an inward direction to form the recess Figure 13 is a view similar to Figure 11 showor pocket H, the bottom I8 of this recess or ing modifications; pocket being located so that the median plane Figure 14 is a View similar to Figure 6 showing of the space between this bottom and the back of 45 another embodiment of our invention; the adjustment plate is in alignment with the Figures 15 and 16 are cross sections respecmedian plane of the stems or flanges 6 of the tively on the lines I5-I5 and Iii-I6 of Figure 14. shoes. The lower ends of the stems or flanges of The brake mechanism illustrated in Figures 1 the shoes are formed with the flat extensions I9 to 5 inclusive comprises the brake drum i adaptwhich extend toward each other and into the ed. to be secured to a motor vehicle wheel, the space formed between the back I5 and the botbacking plate 2 and the brake shoes 3 within the tom I8. These extensions have preferably sedrum and engageable with its annular brake cured to their opposite sides the fiat wear plates flange 4. These shoes are of T cross section with 20 which with the extensions have approximatethe arcuate head 5 and the stem or flange 6. as ly the same Width as the space. 2I are flat ad- 6O are f orrned'fwith"concaverecesses 35 for fitting 7' justmentflinks'preferably formed of sheet metal having 'a thickness substantially equal to the. {depth of the space between the'back l and the bottomJll. The outeriends of the links have an interfitting engagement with the cooperating 'ends of the extensions-and plates of the shoes,

the outer ends of the links being concavelyzrounded and the innenends of the extensions and plates being convexly rounded.

22 is a wedge having a cylindrical body freely ,engaging within the enlarged :portion 12. This Wedge has the diametricallyopposite grooves 23 which have inclined bottoms which diverge out wardly fromthe inner end of the'wedge. The. adjustment links are'freely engageable in these "grooves and havetheir inner ends engageable with the bottoms of the grooves and correspond:

ingly; inclinedz- The outer- "end, of the wedge -22: abuts the screw all and suitable means 's uch as cooperating projectionsand recesses euponl the adjacent faces of the wedge'and screw, are adapted to indicate successive incrementsof adjust To hold the wedgefrom rotation, the body of the wedgeis formed with the longitudinally extending groove 24 WhlChI is jengageable by the tongue25 formediinth e-back ,liot the adjustmentv plate I 4, ,the central {portion of this back being cut awayto provide an;opening insubstantially axial alignment; with the wedge;

- To prevent accidental disengagementof the linksfromthe remaining parts of the adjustment anchor device, the back l5 of the adjustment plate I I is formed with the benttongues 26 which" are. engageable in the mediangroovesil formed in t he inner sides of the adjustment links near their inner ends, the ends of these grooves'being V engageable with the tongues to'limit movement of the links'in either direction.

4OI i plates andthe adjustment'links' arej less thanthe distances between the' shouldered tongue I 6 1 The widths of theshoe extensions and.- their so that these parts -'may move angularlyithrough' paths parallel'to the backing plate and also paral lel-to'the path'of m'ovement of theshoes sufli ,ciently to enable the lower ends ofjthe friction linings of the 'shoesto engage the brake flange.

' In th'e modification shown in Figures 6," 7 and 8,

thetubular member 28 of the adjustment anchor device has an" enlarged innerend which abuts and is'preferably welded to an outwardly extend ingvtubular portion 29 of the backinglplate- Alsoin this modification the outer ends of the fiat adjustment links 30 and the'adjacent ends of the stems or flanges 3| of the brake shoes 32 are maintainedin alignment by'means of the. headed pins 33 which have the heads 34 at theiropposite ends located onopposite sides of the adjustment linksand'stems o'r flanges. 'The ends.

of the adjustment links an'd the stems or flanges the stem of the pinfbetween'its needs; However, these ends are spaced from each' other to 'fes ,providefor relative 'limite'd angular movement of the ends of 'the' shoes relative to the adjustment links; @The'inn'er ends 'of the links engage in grooves A' formed in opposite sides ,of an adjustment wedge-B slidably' supported in the tubular I portion 29 and advanced by a screw C threadedly 'mounted in the -member 28.: The links are'held injassembled relation on the backing plateby. means of a guide plate D secured tothe backing plate in lateral spaced relation to the inner side thereof;

Figuresf9, '10, 11' and .12 disclose h th er 'emment links 31.

' links and the shoe extensions.

bodiment of our invention in which a flatsheet metal Wedge 36 is adapted to adjust the adjust- The outer ends of these adjustment links are convexly rounded and fit in the concavely rounded inner ends of the stems or.

flangesg38 of the brakeshoes. The inner ends of the adjustment linksfare bifurcated and their furcations 39 embrace the opposite edge portions! 2 of the wedge.

to provide the necessary space for the adjustment 7 This adjustment plate E has the oblong portion. which is engageablei with and guides the head of the wedge. The-backing plate All has a slot 42, the sides of 7 V which also serve'toiguide the wedge; It will thus be seenpthat the adjustment plateand the back- 1 ing plate. whichguide the wedge at longitudinally spaced points thereof hold the same from rotating or tilting angularly; 'Thewedge is ada'pted to i be adjusted by means of the screw 43{th'einner' end of is formed with angularl'y spaced The adjustment plate E atthe. inner side of thebacking plate is in the na L 0 'ture of a forging or casting which is recessed recesses for receiving the outer edge of the wedge which serve to indicate increments of adjustment.

fiThe modification shown in Figure 13 differs adjustment plateiM 'with the longitudinally ex- Qtending grooves 45 forreceiving theprojections I Miu'pon the'adjustment links 41 to hold the adjustment links from accidental disengagement a The projections are preferably formed byembossing the adjustment links, which are formed of flat sheet metaL- Theadjustment plate n provided with anoblong portion F which is en? 'gageable with andguid'es the head G of the adi 'justmentjwedge A suitable screw 1, similar to the screw 43,'-is provided for adjustingthe wedge H. Figures .14, 15 and and diverging relative to each other in a directioninwardlyfrom the outer end of the wedge. In this modification the adjustment links are bifurcated at their inner-Lends to embrace thev pro-'1' jections. The backing plate 52 is formed with the opening 53 for the' passage, of. the wedge?" and this opening is closed by the dust shield-:54 secured to the outer side of the backing-plate.

. 16 disclose another modifica tion in which the wedge "for adjusting the ad- 7 justment'links 49 is formed with the internally threaded hub15fl and the diametrically opposite projections}! having their outer edges inclined from that of Figures 9, 10 and 11 informing the 55 is athreaded member, suchas a. bolt, having its shank threadedly, engagingflthe wedge and 7 its head at the outer side of and abutting'the shield. Theinner face of the. boltispreferably,

formedof angularly spaced recessesfadapted to cooperate with diametrically.oppositeprojectionsz stamped out from the shield to indicate increments of adjustment, As in the above described forms of the invention, the adjustment, links are guided onthe backing plate by'meansof an-adi justment plate J secured to the backingplate this plate. What we claim as our invention is: 1

v,1. In brake mechanism, the combination with "a brake drum, a backing plate, and a brake fricin lateral spaced relation to the inner side of tion element within and engageable with said drum, of an adjustment anchor device comprising an adjustment bracket rigidly secured to said plate and having innerand outer portions re spectively at theinner and outer sides of said.

plate, said inner portionbeing spaced from and extending substantially parallel .to the adjacent portion of said plate, an ad-justment link opera.-

tively connectedto said: friction element and.

guided'by' said inner portion and adjacent plate portion, and-means carriedby s'aid'louterportion" tion: element within andienga'geable witnsaid:

drum, of an adjustment plate' secured. tosaid backing plate and having a portion" spaced therefrom, saidiifriction element extending'withinthe' space and slidably engaging. said. backing andadjustment plates, andmeansfor adjusting said friction element.

3. In brake mechanism, the combination with a brake drum, a backing plate, and a brake friction element within and engageable with said drum, of an adjustment plate secured to said backing plate and having a portion spaced therefrom, an adjustment link operatively connected to said friction element and extending within the space and slidably engaging said backing and adjustment plates, and means engageable with said link for adjusting the same.

4. In brake mechanism, the combination with a brake drum, a backing plate, and a brake friction element within and engageable with said drum, of an adjustment plate secured to said backing plate and having a portion spaced therefrom, an adjustment link operatively connected to said friction element, said friction element and link extending within the space and being guided by said backing and adjustment plates, and means engageable with said link for adjusting the same.

5. In brake mechanism, the combination with a brake drum, a backing plate, and brake shoes within and engageable with said drum, of an adjustment anchor device comprising an adjustment bracket rigidly secured to said plate and having inner and outer portions respectively at the inner and outer sides of said plate, said inner portion being spaced from and extending substantially parallel to the adjacent portion of said plate, adjustment links extending within the space and guided by said inner portion and adjacent plate portion, said links being operatively connected at their outer ends to said shoes, and means carried by said outer portion for adjusting said links.

6. In brake mechanism, the combination with a. brake drum, a backing plate, and brake shoes within and engageable with said drum, of an adjustment plate secured to said backing plate and having a portion spaced therefrom, adjustment links operatively connected to said shoes and extending within the space and slidably engaging said backing and adjustment plates, and means engageable with said links for adjusting the same. 7

'7. In brake mechanism, the combination with a brake drum, a backing plate, and brakesh oes within and engageable with said drum, of an adjustment anchor device comprising an adjustment bracket rigidly secured to said plate and having inner and outer portions respectively at the inner and outer sides of said plate, said inner portion being spaced from and extending substantially parallel to the adjacent portion of said plate, adjustment links operatively connected to said shoes, said links and shoes being guided by said inner portion and adjacent plate portion, and means engageable with said links for adjusting the same.

8. In brake mechanism, the combination with a brake drum, a backing plate, and brake shoes within and engageable with said: drumyof anadjustable plate secured to saidbacking'plate and having a portion spaced therefrom, adjustment links :operatively connected to said shoes, said; shoes and links extendingwithin the spaceand guided by said backingj'and adjustment plates,. and means engageable with said links foradjusting-the same.

9; .Infibrakemechanism; the combinationwith a brake drum, a backing plate, and a brake'shoe withinfla'ndllengageable with said drum, of. an

adjustmenti'plate secured to said backing plate and having aiportiont spaced therefromyan adjustment linkzoperatively'connected to said shoe and extending within the space and guided by said backing and adjustment plates, a Wedge movable transversely of and engageable with said link for adjusting the same, said wedge having a longitudinally extending groove, rotatable means for adjusting said wedge, and a tongue upon said adjustment plate engageable in the groove of said wedge to hold the latter from rotation.

10. In brake mechanism, the combination with a brake drum, a backing plate, and brake shoes within and engageable with said drum, said brake shoes having flat extensions extending toward each other, of a sheet-metal adjustment plate having aback spaced from said backing plate, and shouldered tongues engageable with and rigidly secured to said backing plate, flat adjustment links having their outer ends in terfitting with said shoe extensions, said links and shoe extensions extending within the space between said backing plate and adjustment plate back and being guided thereby, and means for adjusting said links.

11. In brake mechanism, the combination with a brake drum, a backing plate, and a brake shoe within and engageable with said drum, of an adjustment plate secured to said backing plate and having a portion spaced therefrom, a flat adjustment link extending within the space and guided by said backing and adjustment plates, said link having an end extending adjacent to an end of said shoe, and a pin between said ends having heads at opposite sides thereof for maintaining said ends in alignment. 7

12. In brake mechanism, the combination with a brake drum, a backing plate, and brake shoes within and engageable with said drum, of an adjustment plate secured to said backing plate and having a portion spaced therefrom, adjustment links operatively connected to said shoes and extending within the space and guided by said adjustment plate and provided with bifurcated ends extending toward each other, and a wedge embraced by the furcations of said ends and movable to adjust said links.

13. In brake mechanism, the combination with a brake drum, a backing plate, and brake shoes within and engageable with said drum, said backing plate having a slot between adjacent ends of said brake shoes, of an adjustment plate secured to said backing plate and having a portion spaced therefrom, adjustment links operatively connected to said shoes and extending within the space and guided by said backing and 7' within and engageable witlii'said dium, of anradj u stm'ent plate 'secur ed'to said backlng'plate and 7 having aportion spaeed therefrom, a. flatadjus't- V merit link extending withinltlie spacean'd guidedw byxsaid :bapking'fand' adjustment plates, saidlink, having an end mae -atlvely connected to one end offsaid shoe; andcdoperatingfmeans upon said; 7 adjustment plate and link to? holding said-link 1 .-fr0m accidental disengagement from saidadjust-b merit plate. ,7

15. m brake mecha 5n the cdmblnatidn with 'ja'. brake drum, abackingplate, andbrakeisho'es, within and engageable with said drum, said back- 7 7 ing plate having anmpeningbetween -adjacent dust shield secured to the uter side of said back? ing plate, and a threadedmember 'carried'by said 1 7 a shield and threadedlyengaging said wed'ge; ra ends of said shoes of an adji1stment plate 'secured to'said backingiplate and having a portion CHARLES A, SAW'I'ELLEr; 

